Question

In Transum prison there are 0 prisoners in cells numbered 1 to 10.
On day 1, the guard turns the key in every lock to open every cell.
On day 2, the guard turns the key in every cell which is a multiple of 2. This locks all the
even numbered cells.
On day 3, the guard turns the key in every cell which is a multiple of 3, locking or
unlocking them.
On day 4, the guard turns the key in every cell which is a multiple of 4, locking or
unlocking them.
This continues for ten days. The prisoners whose cells are open after the 10th day are set.
free.
6
Question 1:
How many prisoners will be set free?
(a) 10
(b) 5
(C) 3
(d) 4​

Answer 1

Answer:

10 or Option a

Step-by-step explanation: